Bouncy Castle JCE Provider up to 1.55 ECDSA signature verification

Summaryinfo

A vulnerability was found in Bouncy Castle JCE Provider up to 1.55. It has been classified as critical. Affected by this issue is some unknown functionality of the component ECDSA. The manipulation leads to signature verification. This vulnerability is listed as CVE-2016-1000342. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Bouncy Castle JCE Provider up to 1.55 and classified as critical. This issue affects an unknown code block of the component ECDSA. The manipulation with an unknown input leads to a signature verification vulnerability. Using CWE to declare the problem leads to CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Bouncy Castle JCE Provider version 1.55 and earlier ECDSA does not fully validate ASN.1 encoding of signature on verification. It is possible to inject extra elements in the sequence making up the signature and still have it validate, which in some cases may allow the introduction of 'invisible' data into a signed structure.

The bug was discovered 07/07/2018. The weakness was presented 06/04/2018 (GitHub Repository). It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2016-1000342 since 06/04/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 110948 (Debian DLA-1418-1 : bouncycastle security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171315 (OpenSUSE Security Update for bouncycastle (openSUSE-SU-2018:1689-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (110948). See VDB-118491, VDB-118820, VDB-118821 and VDB-118822 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Bouncy Castle

Name

• JCE Provider

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46
• 1.47
• 1.48
• 1.49
• 1.50
• 1.51
• 1.52
• 1.53
• 1.54
• 1.55

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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